Thermostatic boiler bypass?

JohnNY · March 2009

What do you think?

(see pic)

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Unknown · March 2009

John

Wouldn`t you want the return temp to close the valve?

Dave

Mark Custis · March 2009

John

I think Dave is correct.

The sensor should be on the return below the cross over.

JohnNY · March 2009

Yes.

I agree.

Thanks.

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Mark Eatherton · March 2009

If its a German boiler...

the first location would werk.

But if its an American boiler, what the other guys said...

ME

Unknown · March 2009

John

Ever tried those ESBE thermostatic valves available through Danfoss?
They may be a better price, and it has no probe.

Dave

Mark Custis · March 2009

OK Dave & John

You got me. Just bought a big CI for construction heat and snow melt for a MacMansion. The dealer needed the cash flow and it was almost free. The "REAL" heat will be radiant powered by solar then mod/cons.

That valve and set up would make my life easier and save a ton of plumbing.

Thanks

JohnNY · March 2009

Got a new client with a c.i. boiler suffering from condensation.

You might've guessed I'm trying to create an inexpensive and effective bypass that I can fit on some lower-cost installations and retrofits.
Unfortunately, I just got a price on the valve I wanted to use for this.

and it's gonna cost me $450/per unit.
Vaffanculo for $450.

So, it's back to the proverbial drawing board for me.

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Unknown · March 2009

Say John,

would something like this fit the bill?

Dave

JohnNY · March 2009

It would, Dave, thank you.

I had considered using that very unit but was trying to avoid using a three-way valve.
I see I may have to.

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tim smith · March 2009

John, there was a valve that Weil Mclain used with thermostatic

control in it for boiler protection. I think it was on the HE or VHE boilers. I think it was made by Taco??? cast body. Tim

Henry · March 2009

We use White-Roger's motorised valves of 1/2 the diameter of the return line, in the bypass line. We control it with a snap disc set for 130F on the return to the boiler. It is cheap, works well and so far 9 years, not one snap disc or motorised valve has been replaced!

JohnNY · March 2009

What's that?

A little 24volt zone-type valve wired right to the transformer switched by the snap disc aquastat?

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Thermostatic boiler bypass?

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